TNT first announced plans to revive Dallas in September. The show is expected to focus on the rivalry between the Ewing brothers.
TV Line says that Strong will star in the pilot as Bobby Ewing's wife Ann.
Strong is best known for her role as Mary-Alice Young in Desperate Housewives. She has appeared in several episodes and provides the show's voiceover.
Strong has also worked on programmes including Sports Night, Party Of Five and Everwood.
Patrick Duffy has already signed up to reprise his role as Bobby in Dallas, while his co-star Linda Gray will return as Sue Ellen. Original star Larry Hagman will return as JR Ewing in the TNT project.
The cast also includes stars such as Jesse Metcalfe, Julie Gonzalo, Josh Henderson and Jordana Brewster.
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